Pneumatically-operated gong.



N0.873,725. PTNTED 1350,17, 1907. F. B. SORRY. PNEUMATIOALLY OPBRATEDGGNG.

APPLICATION FILED MAY 28, 1904.

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y. Y INVNTQR. A 4 Y l F-red BGQFeLTg.

i efficient mechanism which is simple and comat their ends to spacinglocks 28 29 which are cut away atltheir adjacent ends"\in the mannerillustrated in Fig. 2,v thus leaving i VUmiED STATESA PATENT OFFICE.

FRED B. COREY, OF ySCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMPANY,

- A CORPORATION OF NEW YORK. l

PNE'HATICALLY-OPERATED GONG.

. Specification of Letters Paten't.

Patented nee. i?, 1907.

application nea nay 23.1904. serial No. 209.293.

.erating mechanism and has particular refer' ence topneumatically-operated means for performing this function. Y p ,Theobject ofthe invention is to provide an pact in structure.

To this end it comprises certain novel features which will be bestunderstood from the following detailed description of one embodi-I mentof the invention taken in connection with the accompanying drawing, andthe scope of the invention will be particularly pointed out in theappended claims.

Figure 1 of said drawin sis a side elevatigr of the complete deviceilustratingthe "ong and the pneumatic cylinder in section fig. 2 is 'afragmentary plan view designed particu larly to illustrate the o erationof the device;\ Fig. 3 is an end view il ustrating particularly thehammer and' its connections with other. parts of the mechanism; and Fig.4 is a detailed view illustrating the spring cushion for the hammer.Throughout these gures like characters refer to like parts.

Referring in detail to the drawings, designates the gong which issecured by a bolt 1 1 to the upper end of the ost 12 mounted on-` theupper side of the ase-plate 13. The hammer 14 is secured to the upperend of a pin 15 which is journaled lin the base-plate` 13 and terminatesat its lower end in a laterallyextending arm 16. The hammer 14 is alsoprovided with a laterally-extending arm `17 which extends in the samedirection as the arm 16 but above the base-plate',\;.-`Tleput`er end ofthe arm 17 is connected tafixed post\ 18 by a coiled tension spring 19.The hammer and its actuating spring'are located within the peri hery ofthe gong 10 and between it and the base-plate 13. From the above it willbe seen that when the hammer is moved to the dotted line osition of Fig.2 the spring 19 will be put un er strain and as soon as the hammer isreleased it will ily outwardagainst the gon In angler to prevent thehammer from re-Y maining in contact with the gong after it has deliveredits blow, a spring cushion is provided which is adapted to engage adownwardly-extending yprojection 20 on the hammer. This cusluon consistsof a spring 21 yond the end of the spring case 23 vformed integral withthe base-plate 13.

In order to place the spring 19 under strain, I employ a reciprocatorydriving memberl 24 located on the under Side of the guide's 25. Themember 24 consists essentially of upper and-lower lates 26 27 secured anopen s ace at the center of themember held in the full-line position ofFig. 2 by a spring 31. When in this position the outer end ofthe pawl isadapted to engage the lat- `erallyprojecting arm 16 of the hammer 14 assaid member reciprocates. Thus it will be seen that when the member 24is moved formward, the hammer is rocked about its pivot and the spring19 is put-under strain. movement continues until the tail 32 of the pawlstrikes the fixed pin 33. lWhen this der the strain of the spring 19.The pin 33 ,is located so as to tri the pawl before .the member 24reaches t e end of its forward movement. i v l In order to reciprocatethe member 24, I employ ya piston 34 to move the member forward and thespring 35 to return it. The piston 34 is located in a cylinder 36 whichis provided with supply and exhaust ports and ports areI "controlled bya slide-valve 39 mounted on thevalve stem 40. A lost-motion connectionbetween the valve and the stem i's`p`rovided by making the length of thevalve shorter than the distance between the engaging surfaces 41 and 42of the piston. On the opposite side of the/piston 34 is a pin 43 whichextends through the head of the cylinder and abuts against the end ofthe rec xprocating member 24. When com ressed air or other i'uid underpressure is a mitted "to the right of the iston 34 throughthe port 37,the piston be forced forward. and

splate 13 .and adapted to reciprocate in the.

between t e plates 26 and 27 for'the pivotd.y actuating pawl 30. Thispawl is normally which normally forces a bolt 22 slightly be- Thisoccurs, the pawl is thrown out of engagement and the hammer blow isdelivered unpassagesfT---and 38 respectively. These will carry themember 24 with it to st ore energy in the spring 19 and then trip thehammer loose so as to strike the ong. As the'piston 34 moves forward,thes ide valve l39 is engaged by the member 42' and moved so as to closethe supply port 37 and open `the exhaustport` 38.

In 'order that this movement oi thevalve may be sufficient toVcompletely close the port 37 and completely open the port '38', .thetripping mechanism is arranged so that the hammer 14 willl befreedbefore the piston reaches the forward end of its stroke. v This,has the edect oi" suddenly removing the resistance'to the forwardmovement of the piston and allowing the eX- pansion of the air behindthe piston' to carry 1t and the valve forward so as tol make a quick andcom lete closing voi the one port and openingo the other. As soon as thesupply port is closed and theeXhaust portA is opened, the air willescape from the right of the piston and the spring 35 which is connectedbetween the member 24 and the basen plate 13 will return said member andwith it the piston. Since this movement is relatively slow, as soon asthe valve 39 is en-f lgaged by the bearing 41 on the movement will becorrespondingy slow in iston, its

opening the supply port and closing the eX- haust port. In vorder thatair admitted through the port 37 when it is partiallyopen maynotbe'suflicient to stop the backward movementofthe piston and thus producean unsatisfactory operation-of the device, thecylinder at the righ-t ofthe piston is made of such :capacity that the expansion of the air thatmay enter the cylinder through apar'- tially-opened supply ort will beinsuiiicient to stop the piston be ore the valve hascom- A40.

pletely opened the supply port-and closed the exhaust port. In thepresent instance,

this enlarged capacity ofthe cylinder is ob- Iclosed. It will also beapparent to those skilled in the art that many alterations and'modifications may be made in the construction of the device hereindisclc sed without departing from the spirit ,and'scope of my in-f`vention, I, therefore, do not wish to be limited to the speciiic'mattershown, but aim to cover bythe terms of the appended 'claims all suchalterations and modiiications.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,

1. In combination with l`a gong, an automatic ringing mechanismcomprising 'a spring# actuated hammer,l a reciprocatory member carryingapivoted'spring pressed pawlarranged to cooperate with said hammer,fluid-operated meansfor reciprocating'I said member, anda fixedabutmentv which, near one limit of movement of 'said' member, engageswith said pawl and'moves it out of engagement vwith said hammer to allowsaid hammer to strike said-gong.' i

-2. In combination with a gong-, matic ringing mechanism comprising ahammer, a spring tending to move said hammer toward said gong, a recirocatory member arranged adjacent said iiammer, a 4spring tendingtovhold said member at onelimit of its movement, a pawl carried by saidmemlber and normally held by a spring in engagement withsaid'hammenmeans for reciprocating said member, and a iiXed abutmentwhich engages with said awl near one limit of movement of said mem erand lmoves saidan aut'opawl out of engagement with said hammer allowingthe spring attached to said hammer to bring said hammer in to forciblecontact with said gon v.

'3. In combination with a gong, an automatic ringing mechanism comprisina ham- 1 mer, aspring tending to draw saidammer toward said gong, areclprocatory member' arranged adjacentsaid hammer, a pawlcarried bysaid mem-ber and arranged to engage with said hammer While said memberis moved in one direction, a fixed abutment ior disengaging/said' pawlfrom said hammer .when said 4member' is near one of its limits of lmovement, a piston movable by fluid p ressure for moving said member'inone direction, a cylinder for said piston provided withosupply andvexhaust-ports, a valve carried by said piston and movable over saidports, and a spring attached to said reciprocatory member and adapted toreturn said member and piston after-they have been moved in onedirection by the fluid pressure.

iio

In witness whereof, Ihave-hereunto set my hand this 21st day of May,1904.

' l FRED B.- COREY.

Witnesses:

BENJAMIN B. HULL, HELEN Oiironn.

